Regex (or regexp) is known as regular expression matching of patterns, strings or characters in, for example, a large text file. Questions should be tagged as such whatever the programming language involved and the tag can also apply to command-line or graphical programs that have regex plugins or ...

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22
votes
3answers
9k views

apt-get remove with wildcard removed way more than expected. why?

Last night I was trying to burn CDs. Being annoyed with k3b and choosing to use brasero instead, I went to remove k3b. I typed in: sudo apt-get remove k3b I hit tab twice and saw that I had both ...
13
votes
5answers
11k views

Recommendation for Regex editor?

I asked for recommendations for Regex editors on stackoverflow a while ago. Following is one of the replies: What is "good" depends on what is most useful to you. For me, though, these are ...
13
votes
6answers
41k views

How to search for all the files starting with the name “ABC” in a directory?

I need to search for files starting with some particular name. There can be multiple files starting with a particular pattern and I want to list all such files present in the directory.
5
votes
3answers
4k views

grep for string not preceded by another string

Is it possible, using grep, to search for instances of John Smith but exclude instances of Mr John Smith?
4
votes
1answer
51 views

Why doesn't cp detect '\ ' (backslash+space)?

I was trying to write a shell script to copy files. Here is what I have done. workingDirectory=$(pwd | sed "s/ /\\ /g") Now echo $workingDirectory shows /home/user/Documents/Learning and ...
3
votes
4answers
298 views

Bash create custom string

how could in bash a pattern like ROW1 n1 n2 n3 n4 up to 300 be done with some command in bash or also just perl...the delimiter would need to be \t as above
19
votes
2answers
17k views

Pattern based, batch file rename in terminal

I need to rename the following: file_001_loremipsum.png file_002_dolor.png file_003_sit.png file_004_amet.png file_105_randomness.png into upl_loremipsum.png upl_dolor.png upl_sit.png upl_amet.png ...
7
votes
3answers
15k views

Install Regex plugin for Gedit

I am using Ubuntu 12.04.I want to install Regex Search and Replace plugin for Gedit.So can some one please tell me where can I get it and install it.Any help and suggestions will be highly appreciable....
4
votes
1answer
2k views

How to replace strings in file without regex?

I need to replace some strings in files (from command line) but I don't want to use sed -i because my string contains lots of funny characters which need to be correctly escaped. Is there a way to ...
1
vote
4answers
811 views

Change directory structure from /YEAR/MONTH/DAY/ to /YEAR-MONTH-DAY

I need to change my directory structure for my photos from /YEAR/MONTH/DAY/ to /YEAR-MONTH-DAY I know this can sort of be done with exiftool, but it will only work on files containing EXIF-tags, and ...
3
votes
1answer
202 views

What happens if we add a dot at the end of sudo `apt-get autoremove`

sudo apt-get autoremove . OUTPUT: WARNING: The following essential packages will be removed. This should NOT be done unless you know exactly what you are doing! apt libapt-pkg4.12 (due to apt) libc6 ...
2
votes
3answers
149 views

keybind to toggle touchpad in lubuntu (openbox)

I'm using lubuntu. I want to add a shortcut to toggle (turn on and off) my touchpad. I know I need to edit the xml file in ~/.config/openbox (in my case it's lubuntu-rc.xml) as described here and ...
1
vote
2answers
649 views

Has this Windows application been successfully installed via Wine?

I just installed Expresso via Wine Windows Program Loader. The installation seemed to be fine. But when I click the program item from Applications -> Wine -> Programs -> Expresso -> Expresso, the ...
1
vote
1answer
167 views

Find and replace regular expression (matching unicode character class Devanagari) in multiple files

Say you have a file named test.txt with the following lines: ಕದಂಬ कदम्ब Then, suppose you want to replace each devanagarI unicode character (ie in कदम्ब) with a D. Then, you might think that the ...
0
votes
1answer
668 views

how can i use grep to find IPV4 Number in a pcap file with regx syntac?

I'm new in ubuntu. I have this IP regex '\b((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)(\.|$)){4}\b' I have a network pcap file, I want to use this regex and the grep -e to find all IP address in the file....